Sept 9, 2018; New York, NY, USA; Novak Djokovic of Serbia kisses the U.S. Open trophy after beating Juan Martin del Potro of Argentina in the men's final on day fourteen of the 2018 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Robert Deutsch-USA TODAY Sports

Foto: Robert Deutsch

Sept 9, 2018; New York, NY, USA; Novak Djokovic of Serbia celebrates a service break in the 3rd set against Juan Martin del Potro of Argentina in the men's final on day fourteen of the 2018 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Robert Deutsch-USA TODAY Sports TPX IMAGES OF THE DAY

Foto: Robert Deutsch

Sept 9, 2018; New York, NY, USA;
Novak Djokovic of Serbia with the U.S. Open trophy after beating Juan Martin del Potro of Argentina in the men's final on day fourteen of the 2018 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Robert Deutsch-USA TODAY Sports

Foto: Robert Deutsch

Sept 9, 2018; New York, NY, USA; Novak Djokovic of Serbia poses with the U.S. Open trophy after beating Juan Martin del Potro of Argentina in the men's final on day fourteen of the 2018 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Robert Deutsch-USA TODAY Sports

Foto: Robert Deutsch

Sept 9, 2018; New York, NY, USA; Novak Djokovic of Serbia (right) and Juan Martin del Potro of Argentina stand with their trophies after the men's final on day fourteen of the 2018 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Robert Deutsch-USA TODAY Sports